Battery

Abstract

A battery according to the present disclosure includes a plurality of cells that are electrically connected in parallel. Each of the plurality of cells includes a positive electrode layer, a negative electrode layer, a current collector that is in contact with the positive electrode layer or the negative electrode layer, and an electrolyte layer disposed between the positive electrode layer and the negative electrode layer. A side surface of the current collector includes an exposed portion exposed from the electrolyte layer and a shielded portion shielded by the electrolyte layer, and an area of the shielded portion is larger than an area of the exposed portion.

What is claimed is: 
     
         1 . A battery comprising:
 a plurality of cells that are electrically connected in parallel, each of the plurality of cells including a positive electrode layer, a negative electrode layer, a current collector that is in contact with the positive electrode layer or the negative electrode layer, and an electrolyte layer disposed between the positive electrode layer and the negative electrode layer,   wherein a side surface of the current collector includes an exposed portion exposed from the electrolyte layer and a shielded portion shielded by the electrolyte layer, and   an area of the shielded portion is larger than an area of the exposed portion.   
     
     
         2 . The battery according to  claim 1 , further comprising a terminal electrically connected to the current collector,
 wherein the exposed portion is in contact with the terminal.   
     
     
         3 . The battery according to  claim 1 , wherein
 the electrolyte layer is a solid electrolyte layer containing a solid electrolyte.   
     
     
         4 . The battery according to  claim 1 , wherein
 the electrolyte layers of adjacent ones of the plurality of cells are joined to each other around the shielded portion.   
     
     
         5 . The battery according to  claim 1 , wherein
 the current collector has a protruding portion; and   the exposed portion is included in the protruding portion.   
     
     
         6 . The battery according to  claim 5 , wherein
 the current collector has a remaining portion other than the protruding portion; and   a width of the protruding portion is smaller than a width of the remaining portion.   
     
     
         7 . The battery according to  claim 5 , wherein
 the current collector has a remaining portion other than the protruding portion; and   a thickness of the protruding portion is smaller than a thickness of the remaining portion.   
     
     
         8 . The battery according to  claim 1 , wherein
 the current collector has a through hole.   
     
     
         9 . The battery according to  claim 8 , wherein
 the electrolyte layer is present in the through hole.   
     
     
         10 . The battery according to  claim 1 , further comprising a joining layer,
 wherein the joining layer is located on an interface between the current collector and the electrolyte layer and contains at least one kind of element among elements contained in the current collector and at least one kind of element among elements contained in the electrolyte layer.   
     
     
         11 . The battery according to  claim 10 , wherein
 the joining layer is present on an interface between the shielded portion and the electrolyte layer.   
     
     
         12 . The battery according to  claim 1 , further comprising a dummy current collector around the shielded portion of the current collector. 
     
     
         13 . The battery according to  claim 12 , wherein
 the dummy current collector contains the same material as the current collector.   
     
     
         14 . The battery according to  claim 12 , wherein
 the dummy current collector contains an insulating material.   
     
     
         15 . The battery according to  claim 12 , wherein
 the dummy current collector is electrically separate from the current collector.   
     
     
         16 . The battery according to  claim 15 , wherein
 the dummy current collector is separate from the current collector.   
     
     
         17 . The battery according to  claim 12 , wherein
 the dummy current collector is exposed from the electrolyte layer.   
     
     
         18 . The battery according to  claim 12 , wherein
 each of the plurality of cells has a flat plate shape;   the plurality of cells are laminated on one another to constitute the battery; and   the dummy current collector is located at the same height as the current collector in a direction in which the plurality of cells are laminated.   
     
     
         19 . The battery according to  claim 12 , wherein
 each of the plurality of cells has a flat plate shape;   the plurality of cells are laminated on one another to constitute the battery; and   the dummy current collector is located at a height different from the current collector in a direction in which the plurality of cells are laminated.